From: Peter Zijlstra <peterz@infradead.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>, Uros Bizjak <ubizjak@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, Dennis Zhou <dennis@kernel.org>,
Tejun Heo <tj@kernel.org>, Christoph Lameter <cl@linux.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>
Subject: Re: [PATCH v1 1/1] x86/percpu: Cast -1 to argument type when comparing in percpu_add_op()
Date: Thu, 17 Oct 2024 20:18:59 +0200 [thread overview]
Message-ID: <20241017181859.GB17263@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <de705cdf-ccce-460f-846e-dfc63c63af1a@intel.com>
On Wed, Oct 16, 2024 at 12:44:18PM -0700, Dave Hansen wrote:
> Would anybody hate if we broke this up a bit, like:
>
> const typeof(var) _val = val;
> const int paoconst = __builtin_constant_p(val);
> const int paoinc = paoconst && ((_val) == 1);
> const int paodec = paoconst && ((_val) == (typeof(var))-1);
>
> and then did
>
> if (paoinc)
> percpu_unary_op(size, qual, "inc", var);
> ...
I think that is an overall improvement. Proceed! :-)
next prev parent reply other threads:[~2024-10-17 18:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-05 17:03 Andy Shevchenko
2024-10-16 13:37 ` Andy Shevchenko
2024-10-16 15:44 ` Dave Hansen
2024-10-16 17:03 ` Nick Desaulniers
2024-10-16 18:06 ` Andy Shevchenko
2024-10-16 18:20 ` Andy Shevchenko
2024-10-16 19:43 ` Dave Hansen
2024-10-16 19:20 ` Peter Zijlstra
2024-10-16 19:44 ` Dave Hansen
2024-10-17 18:18 ` Peter Zijlstra [this message]
2024-10-18 12:21 ` Andy Shevchenko
2024-10-22 19:53 ` Dave Hansen
2024-10-22 23:24 ` Christoph Lameter (Ampere)
2024-10-23 17:15 ` Dave Hansen
2024-10-23 21:40 ` H. Peter Anvin
2024-10-23 14:24 ` Andy Shevchenko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20241017181859.GB17263@noisy.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=andriy.shevchenko@linux.intel.com \
--cc=bp@alien8.de \
--cc=cl@linux.com \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=dennis@kernel.org \
--cc=hpa@zytor.com \
--cc=justinstitt@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=llvm@lists.linux.dev \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=morbo@google.com \
--cc=nathan@kernel.org \
--cc=ndesaulniers@google.com \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=ubizjak@gmail.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox